js upload image preview

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Release： 2016-11-10 13:25:26

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<!DOCTYPE html>  
<html>  
<head>  
    <meta charset="UTF-8">  
    <title>Document</title>  
    <script type="text/javascript" src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>  
    <script type="text/javascript">  
    $(function(){  
        $(".file").change(function(){  
            var fileImg = $(".fileImg");  
            var explorer = navigator.userAgent;  
            var imgSrc = $(this)[0].value;  
            if (explorer.indexOf(&#39;MSIE&#39;) >= 0) {  
                if (!/\.(jpg|jpeg|png|JPG|PNG|JPEG)$/.test(imgSrc)) {  
                    imgSrc = "";  
                    fileImg.attr("src","/img/default.png");  
                    return false;  
                }else{  
                    fileImg.attr("src",imgSrc);  
                }  
            }else{  
                if (!/\.(jpg|jpeg|png|JPG|PNG|JPEG)$/.test(imgSrc)) {  
                    imgSrc = "";  
                    fileImg.attr("src","/img/default.png");  
                    return false;  
                }else{  
                    var file = $(this)[0].files[0];  
                    var url = URL.createObjectURL(file);  
                    fileImg.attr("src",url);  
                }  
            }  
        })  
    })  
    </script>  
</head>  
<body>  
    <form enctype="multipart/form-date" method="post">  
        <input type="file">  
        <input type="submit">  
    </form>  
    <img  src="" alt="js upload image preview" >  
</body>  
</html>

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